Expose camera status to QML Camera element

It's exposed as Camera.cameraStatus property.

Change-Id: Id3b477266d3a666b7a2a61cd4579f0e3f873d3b8
Reviewed-by: Mithra Pattison <mithra.pattison@nokia.com>
Reviewed-by: Ling Hu <ling.hu@nokia.com>

src/imports/multimedia/qdeclarativecamera.cpp

@@ -186,6 +186,7 @@ QDeclarativeCamera::QDeclarativeCamera(QObject *parent) :
     connect(m_camera, SIGNAL(captureModeChanged(QCamera::CaptureModes)), this, SIGNAL(captureModeChanged()));
     connect(m_camera, SIGNAL(lockStatusChanged(QCamera::LockStatus,QCamera::LockChangeReason)), this, SIGNAL(lockStatusChanged()));
     connect(m_camera, SIGNAL(stateChanged(QCamera::State)), this, SLOT(_q_updateState(QCamera::State)));
+    connect(m_camera, SIGNAL(statusChanged(QCamera::Status)), this, SIGNAL(cameraStatusChanged()));
     connect(m_camera, SIGNAL(error(QCamera::Error)), this, SLOT(_q_error(QCamera::Error)));
 
     // Note we map availabilityError->availability
@@ -323,6 +324,63 @@ QDeclarativeCamera::State QDeclarativeCamera::cameraState() const
     return m_componentComplete ? QDeclarativeCamera::State(m_camera->state()) : m_pendingState;
 }
 
+/*!
+    \qmlproperty enumeration QtMultimedia5::Camera::cameraStatus
+
+    The current status of the camera instance.
+
+    \table
+    \header \li Value \li Description
+    \row \li ActiveStatus
+         \li The camera has been started and can produce data,
+             viewfinder displays video frames.
+
+             Depending on backend, changing some camera settings like
+             capture mode, codecs or resolution in ActiveState may lead
+             to changing the camera status to LoadedStatus and StartingStatus while
+             the settings are applied and back to ActiveStatus when the camera is ready.
+
+    \row \li StartingStatus
+         \li The camera is starting in result of state transition to Camera.ActiveState.
+             The camera service is not ready to capture yet.
+
+    \row \li StoppingStatus
+         \li The camera is stopping in result of state transition from Camera.ActiveState
+             to Camera.LoadedState or Camera.UnloadedState.
+
+    \row \li StandbyStatus
+         \li The camera is in the power saving standby mode.
+             The camera may enter standby mode after some time of inactivity
+             in the Camera.LoadedState state.
+
+    \row \li LoadedStatus
+         \li The camera is loaded and ready to be configured.
+             This status indicates the camera device is opened and
+             it's possible to query for supported image and video capture settings,
+             like resolution, framerate and codecs.
+
+    \row \li LoadingStatus
+         \li The camera device loading in result of state transition from
+             Camera.UnloadedState to Camera.LoadedState or Camera.ActiveState.
+
+    \row \li UnloadingStatus
+         \li The camera device is unloading in result of state transition from
+             Camera.LoadedState or Camera.ActiveState to Camera.UnloadedState.
+
+    \row \li UnloadedStatus
+         \li The initial camera status, with camera not loaded.
+             The camera capabilities including supported capture settings may be unknown.
+
+    \row \li UnavailableStatus
+         \li The camera or camera backend is not available.
+
+    \endtable
+*/
+QDeclarativeCamera::Status QDeclarativeCamera::cameraStatus() const
+{
+    return QDeclarativeCamera::Status(m_camera->status());
+}
+
 void QDeclarativeCamera::setCameraState(QDeclarativeCamera::State state)
 {
     if (!m_componentComplete) {

src/imports/multimedia/qdeclarativecamera_p.h

@@ -81,6 +81,7 @@ class QDeclarativeCamera : public QObject, public QQmlParserStatus
 
     Q_PROPERTY(CaptureMode captureMode READ captureMode WRITE setCaptureMode NOTIFY captureModeChanged)
     Q_PROPERTY(State cameraState READ cameraState WRITE setCameraState NOTIFY cameraStateChanged)
+    Q_PROPERTY(Status cameraStatus READ cameraStatus NOTIFY cameraStatusChanged)
     Q_PROPERTY(LockStatus lockStatus READ lockStatus NOTIFY lockStatusChanged)
     Q_PROPERTY(Error errorCode READ errorCode NOTIFY errorChanged)
     Q_PROPERTY(QString errorString READ errorString NOTIFY errorChanged)
@@ -102,6 +103,7 @@ class QDeclarativeCamera : public QObject, public QQmlParserStatus
 
     Q_ENUMS(CaptureMode)
     Q_ENUMS(State)
+    Q_ENUMS(Status)
     Q_ENUMS(LockStatus)
     Q_ENUMS(Error)
 
@@ -127,6 +129,19 @@ public:
         UnloadedState = QCamera::UnloadedState
     };
 
+    enum Status
+    {
+        UnavailableStatus = QCamera::UnavailableStatus,
+        UnloadedStatus = QCamera::UnloadedStatus,
+        LoadingStatus = QCamera::LoadingStatus,
+        UnloadingStatus = QCamera::UnloadingStatus,
+        LoadedStatus = QCamera::LoadedStatus,
+        StandbyStatus = QCamera::StandbyStatus,
+        StartingStatus = QCamera::StartingStatus,
+        StoppingStatus = QCamera::StoppingStatus,
+        ActiveStatus = QCamera::ActiveStatus
+    };
+
     enum LockStatus
     {
         Unlocked = QCamera::Unlocked,
@@ -220,6 +235,7 @@ public:
 
     CaptureMode captureMode() const;
     State cameraState() const;
+    Status cameraStatus() const;
 
     Error errorCode() const;
     QString errorString() const;
@@ -254,6 +270,7 @@ Q_SIGNALS:
 
     void captureModeChanged();
     void cameraStateChanged(QDeclarativeCamera::State);
+    void cameraStatusChanged();
 
     void lockStatusChanged();